核酸分子中对遗传信息的携带和传递起关键作用的结构是() A.核糖 B.磷酸基团 C.

题型:单项选择题 A1型题

问题:

核酸分子中对遗传信息的携带和传递起关键作用的结构是()

A.核糖

B.磷酸基团

C.磷酸戊糖骨架

D.碱基序列

E.脱氧核糖序列

考点:临床执业医师核酸的结构与功能核酸的结构与功能题库
题型:单项选择题 A1型题

阅读理解。

     Soon it would be the holidays. But before that, there were the end of year exams. All the students had

  been working hard for some time. If they didn't pass, they would have to retake the exams in September.

  There were usually a few who failed, but Kate decided not to be one of them. She had worked hard all

 day, but just before the exams she was working so hard that her sister was worried about her. She was

 staying up too late. The night before the first exam, Barbala insisted  (坚持) that she should have an

 early night and take a sleeping pill. She promised (许诺) to wake her in the morning.

     As she was falling asleep, Kate was worried in case (万一) she over-slept. Her mind kept jumping

  from subject to subject. At last, with the help of the pill, she fell asleep. In no time at all, she was sitting in

  the examination hall, looking at the paper. She couldn't answer any of the questions. Everyone round her

 was writing pages and pages. However hard she thought, she couldn't find anything to write about. She

 kept looking at her watch. Time was running out. There was only one hour left. She started one question,

 wrote two sentences, gave up and tried another one. With only half an hour left she wrote another two

  sentences. By this time she was so worried that she started crying. Her whole body shook (摇晃,震颤).

 It shook so much that it woke her up. She was still in bed and it had all been a terrible dream. A minute

  later, Barbala called her name.

1. Which of the following is true?

    A. All the students were usually successful in their exams.

    B. Most of the students usually passed the year exams.

    C. Only some of the students could pass the end of year exams.

    D. None of the students would take the exams again in September

2. Kate worked very hard before the exams for _____.

    A. she was very poor at her lessons.    

    B. she decided to be the best one in her class.

    C. she didn't work hard all year.        

    D. she didn't want to fail in them.

3. Why did Barbala insist that Kate should take a sleeping pill?

    A. Because she thought Kate should oversleep before the first exam.

    B. Because Kate was so worried about her exams that she couldn't go to sleep at all.

    C. Because Barbala hoped her sister would have a good sleep before the first exam.

    D. Because she had promised to wake her up the next morning.

4. Kate dreamed a terrible dream simply because _____.

    A. she had taken a sleeping pill.        

    B. she was too worried about her exams.

    C. her sister had forgotten to wake her up.

    D. she did not pass the exams.

题型:单项选择题 A1型题

患者男,36岁,因“渐进性背痛1年”来诊。食欲减退,感下肢无力。查体:腰部叩痛。实验室检查:ESR80mm/h。脊柱X线片:胸椎有压缩性骨折,中央有骨质破坏。

该患者首先考虑的诊断是()

A.良性肿瘤

B.结核

C.炎症

D.骨质疏松

E.转移性肿瘤

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客户服务依时序分为售前、售中和售后3个阶段,属于售后服务的是()。

A.产品运送

B.服务流程规划

C.教育培训

D.产品设计

题型:单项选择题 A1型题

Hb中一个亚基与其配体(O2)结合后,促使其构象发生变化,从而影响此寡聚体与另一亚基与配体的结合能力,此现象称为()

A.协同效应

B.共价修饰

C.化学修饰

D.激活效应

E.别构效应

题型:单项选择题 A1型题

一个个人经济上存在问题的公司职员有权独立访问高敏感度的信息,他可能窃取这些信息卖给公司的竞争对手,如何控制这个风险()

A.开除这名职员

B.限制这名职员访问敏感信息

C.删除敏感信息

D.将此职员送公安部门

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